H.M.S. Communications, Inc.

Inmarsat-B

Inmarsat-B is the digital successor to Inmarsat-A. It supports high-quality direct-dial
phone, telex, fax, data, and high-speed data. Inmarsat-B is a lower cost alternative to
Inmarsat-A because the system is based on modern digital satellite telecommunications
technologies. The use of digital technology enables Inmarsat-B to improve on
Inmarsat-A, through less power usage and improved use of satellite power and bandwidth.